Stockholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share Repurchases [Abstract]
Stock Repurchase Shares Authorized	3,300
Treasury Stock, Shares, Acquired	922	3,757	0
Repurchases of common stock	$ (14,678)	$ (74,024)	$ 0
Payments of Dividends	$ 6,700	$ 6,900	$ 7,000